### Abstract

A frequency-domain technique to extract the normal mode from the measurement data for highly coupled structures is developed. The relation between the complex frequency response functions and the normal frequency response functions is derived. An algorithm is developed to calculate the normal modes from the complex frequency response functions. In this algorithm, only the magnitude and phase data at the undamped natural frequencies are utilized to extract the normal mode shapes. In addition, the developed technique is independent of the damping types. It is only dependent on the model of analysis. Two experimental examples are employed to illustrate the applicability of the technique. The effects due to different measurement locations are addressed. The results indicate that this technique can successfully extract the normal modes from the noisy frequency response functions of a highly coupled incomplete system.

Original language | English |
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Title of host publication | 15th Biennial Conference on Mechanical Vibration and Noise |

Editors | K.W. Wang, B. Yang, J.Q. Sun, K. Seto, K. Yoshida, al et al |

Volume | 84 |

Edition | 3 Pt B/1 |

Publication status | Published - 1995 |

Event | Proceedings of the 1995 ASME Design Engineering Technical Conference. Part C - Boston, MA, USA Duration: 1995 Sep 17 → 1995 Sep 20 |

### Other

Other | Proceedings of the 1995 ASME Design Engineering Technical Conference. Part C |
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City | Boston, MA, USA |

Period | 95-09-17 → 95-09-20 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Engineering(all)

### Cite this

*15th Biennial Conference on Mechanical Vibration and Noise*(3 Pt B/1 ed., Vol. 84)

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*15th Biennial Conference on Mechanical Vibration and Noise.*3 Pt B/1 edn, vol. 84, Proceedings of the 1995 ASME Design Engineering Technical Conference. Part C, Boston, MA, USA, 95-09-17.

**Experimental study for extraction of normal modes.** / Chen, S. Y.; Ju, Ming-Shaung; Tsuei, Y. G.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

TY - CHAP

T1 - Experimental study for extraction of normal modes

AU - Chen, S. Y.

AU - Ju, Ming-Shaung

AU - Tsuei, Y. G.

PY - 1995

Y1 - 1995

N2 - A frequency-domain technique to extract the normal mode from the measurement data for highly coupled structures is developed. The relation between the complex frequency response functions and the normal frequency response functions is derived. An algorithm is developed to calculate the normal modes from the complex frequency response functions. In this algorithm, only the magnitude and phase data at the undamped natural frequencies are utilized to extract the normal mode shapes. In addition, the developed technique is independent of the damping types. It is only dependent on the model of analysis. Two experimental examples are employed to illustrate the applicability of the technique. The effects due to different measurement locations are addressed. The results indicate that this technique can successfully extract the normal modes from the noisy frequency response functions of a highly coupled incomplete system.

AB - A frequency-domain technique to extract the normal mode from the measurement data for highly coupled structures is developed. The relation between the complex frequency response functions and the normal frequency response functions is derived. An algorithm is developed to calculate the normal modes from the complex frequency response functions. In this algorithm, only the magnitude and phase data at the undamped natural frequencies are utilized to extract the normal mode shapes. In addition, the developed technique is independent of the damping types. It is only dependent on the model of analysis. Two experimental examples are employed to illustrate the applicability of the technique. The effects due to different measurement locations are addressed. The results indicate that this technique can successfully extract the normal modes from the noisy frequency response functions of a highly coupled incomplete system.

UR - http://www.scopus.com/inward/record.url?scp=0029430380&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029430380&partnerID=8YFLogxK

M3 - Chapter

VL - 84

BT - 15th Biennial Conference on Mechanical Vibration and Noise

A2 - Wang, K.W.

A2 - Yang, B.

A2 - Sun, J.Q.

A2 - Seto, K.

A2 - Yoshida, K.

A2 - et al, al

ER -